iOS 使用UIImagePickerController

来源：互联网发布：淘宝代运营销售话术编辑：程序博客网时间：2024/05/18 01:02

iOS 已经为我们封装好了UIImagePickerController ,使用UIImagePickerController时，需要实现UIImagePickerController协议。

在xib中添加一个按钮，绑定按钮的响应事件，在响应事件中添加如下代码：

?
1
2
3
4
5
6
7
8
9
10
11
12
13
UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera; 
   //判断是否有摄像头
   if(![UIImagePickerController isSourceTypeAvailable:sourceType])
    {
        sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    }
     
    UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
    imagePickerController.delegate = self;   // 设置委托
    imagePickerController.sourceType = sourceType;
    imagePickerController.allowsEditing = YES;
    [self presentViewController:imagePickerController animated:YES completion:nil];  //需要以模态的形式展示
    [imagePickerController release];

记得要实现UIImagePickerControllerDelegate 中的- ( void)imagePickerController:( UIImagePickerController *)picker didFinishPickingMediaWithInfo:( NSDictionary *)info 和

-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker 两个方法，分别时拍照完成的时候调用和取消拍照的时候调用。代码如下：

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
#pragma mark -
#pragma mark UIImagePickerController Method
//完成拍照
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [picker dismissViewControllerAnimated:YES completion:^{}];
    UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
    if(image == nil)
        image = [info objectForKey:UIImagePickerControllerOriginalImage];
     
    [self performSelector:@selector(saveImage:) withObject:image];
     
}
//用户取消拍照
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [picker dismissViewControllerAnimated:YES completion:nil];
}
 
//将照片保存到disk上
-(void)saveImage:(UIImage *)image
{
 
    NSData *imageData = UIImagePNGRepresentation(image);
    if(imageData == nil)
    {
        imageData = UIImageJPEGRepresentation(image, 1.0);
    }
     
    NSDate *date = [NSDate date];
     
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"yyyyMMddHHmmss"];
    _fileName = [[[formatter stringFromDate:date] stringByAppendingPathExtension:@"png"] retain];
     
     
    NSURL *saveURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:_fileName];
     
    [imageData writeToURL:saveURL atomically:YES];
     
     
}

1 0